BR inserted in PRE

[ludo]

Wymeditor insists in adding BR elements inside PRE blocks. They are clearly useless, as a newline character is enough to break the line in a PRe block. And BRs are clearly annoying, especially when the block contains code that is passed to an external syntax highlighting plugin, where often the added BRs mess up everything.

[brianthecoder]

I just want to specify that br tags will be inserted if you edit it in the html mode and then switch to the styled view. This is a pretty serious bug.

[jf.hovinne]

This is another designMode issue, and the solution isn't obvious, since the browsers needs the BR tags in order to edit the content.

I tried to fix this in the keydown/keyup events handlers, and got an headache.

Also tried the DOM replace with jQuery, which was a bad idea (see r623).

Finally, I think r625 does the trick, and removes the unwanted BR tags.